mdadm -C /dev/md0 -l 1 -n 2 /dev/sdb1 /dev/sdc1
stop
mdadm --stop /dev/md0
mkfs.ext4 -E lazy_itable_init /dev/sd1
list
https://serverfault.com/questions/650151/how-do-i-list-which-drives-are-part-of-each-raid-array
cat /proc/mdstat
$ cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [linear] [multipath]
md0 : active raid1 sdf2[1] sde2[0]
81854336 blocks super 1.2 [2/2] [UU]
md127 : active raid0 sdf3[1] sde3[0]
286718976 blocks super 1.2 512k chunks
unused devices: <none>